On Windows, some of the installation steps are bit more work, especially adding Gitify to your PATH variable.

This question on Stack Overflow explains the procedure of editing the PATH variable on Windows 7: http://stackoverflow.com/questions/7307548/how-to-access-php-with-the-command-line-on-windows/7307581#7307581

It's common on Windows that you need to add PHP, MySQL and the Gitify executables to the PATH.

Additional Dependencies

Here are the Windows dependencies in order to get the script to execute properly. They must be installed and their bin folders have to be added to the Windows PATH environment variable in the Advanced System Settings screen: